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Your first word function returns reference to a range of characters(string slice, or &str) from a String type. So first_word depends on input_string being untouched.
Clear(): Truncates this String, removing all contents.
You are basically emptying a string then trying to print it. It doesn’t make sense at all. What is your aim with clear method there? -
@aviophile
I was trying to understand this first_word example from the Rust documentation
https://doc.rust-lang.org/book/...
And hence the code!
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